Are Candidates' Policy Changes Flip-Flops?

There's been a lot of talk in this presidential campaign of both Sens. John McCain and Barack Obama flip-flopping on issues. But will this accusation — that has done so much in the past to sink presidential candidates — have the same resonance with voters this time around?

Correction Sept. 22, 2008

In some on-air versions of this story, we incorrectly referred to FISA as the "Federal Intelligence Security Act." In fact, FISA stands for Foreign Intelligence Surveillance Act.